Definition 41.2.5 (Positive).label Let $A, B$ be $C^{*}$-algebra, $S \subset A$ and $T \subset B$ be operator systems, and $\phi: S \to T$ be a linear map, then $\phi$ is positive if $\phi(S_{+}) \subset \phi(T_{+})$.
Definition 41.2.5 (Positive).label Let $A, B$ be $C^{*}$-algebra, $S \subset A$ and $T \subset B$ be operator systems, and $\phi: S \to T$ be a linear map, then $\phi$ is positive if $\phi(S_{+}) \subset \phi(T_{+})$.
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